/**
 * UGENE - Integrated Bioinformatics Tools.
 * Copyright (C) 2008-2020 UniPro <ugene@unipro.ru>
 * http://ugene.net
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
 * MA 02110-1301, USA.
 */

#ifndef _U2_WORKFLOW_ITEM_STYLE_H_
#define _U2_WORKFLOW_ITEM_STYLE_H_

#include <QAction>
#include <QGraphicsItem>
#include <QGraphicsScene>
#include <QTextDocument>

class QDomElement;

namespace U2 {

class WorkflowProcessItem;

const qreal R = 30;
const qreal A = 8;

class ItemViewStyle : public QGraphicsObject {
    Q_OBJECT
public:
    ItemViewStyle(WorkflowProcessItem *p, const QString &id);
    QString getId() const {
        return id;
    }

    virtual void refresh() {
    }
    virtual bool sceneEventFilter(QGraphicsItem *, QEvent *) {
        return false;
    }
    virtual QList<QAction *> getContextMenuActions() const {
        return (QList<QAction *>() << bgColorAction << fontAction);
    }
    virtual void saveState(QDomElement &) const;
    virtual void loadState(QDomElement &);
    virtual QColor defaultColor() const = 0;
    QColor getBgColor() const {
        return bgColor;
    }
    void setBgColor(const QColor &color) {
        bgColor = color;
    }
    QFont defaultFont() const {
        return defFont;
    }
    void setDefaultFont(const QFont &font) {
        defFont = font;
    }
    WorkflowProcessItem const *getOwner() const {
        return owner;
    }

protected:
    WorkflowProcessItem *owner;
    QColor bgColor;
    QFont defFont;

    QAction *bgColorAction;
    QAction *fontAction;
    QString id;

private slots:
    void selectBGColor();
    void selectFont();
};

class SimpleProcStyle : public ItemViewStyle {
public:
    SimpleProcStyle(WorkflowProcessItem *pit);
    QRectF boundingRect(void) const;
    QPainterPath shape() const;
    QColor defaultColor() const;
    void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget = 0);
};

class DescriptionItem;

class ExtendedProcStyle : public ItemViewStyle {
    Q_OBJECT
public:
    ExtendedProcStyle(WorkflowProcessItem *pit);
    QRectF boundingRect(void) const {
        return bounds;
    }
    QPainterPath shape() const;
    QColor defaultColor() const;
    void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget = 0);
    virtual void refresh();
    virtual bool sceneEventFilter(QGraphicsItem *watched, QEvent *event);
    virtual QList<QAction *> getContextMenuActions() const;
    virtual void saveState(QDomElement &) const;
    virtual void loadState(QDomElement &);

    bool isAutoResized() const {
        return autoResize;
    }
    void setFixedBounds(const QRectF &b);

    bool updateCursor(const QPointF &pos);

signals:
    void linkActivated(const QString &);

private slots:
    void setAutoResizeEnabled(bool b);
    void linkHovered(const QString &);

private:
    QTextDocument *doc;
    QRectF bounds;
    bool autoResize;

    enum ResizeMode { NoResize = 0,
                      RightResize = 1,
                      LeftResize = 2,
                      BottomResize = 4,
                      TopResize = 8,
                      RBResize = RightResize + BottomResize,
                      RTResize = RightResize + TopResize,
                      LBResize = LeftResize + BottomResize,
                      LTResize = LeftResize + TopResize };
    int resizing;

    QAction *resizeModeAction;
    DescriptionItem *desc;
    friend class DescriptionItem;
};

class HintItem : public QGraphicsTextItem {
public:
    HintItem(const QString &text, QGraphicsItem *parent);

protected:
    virtual QVariant itemChange(GraphicsItemChange change, const QVariant &value);
    virtual void mouseMoveEvent(QGraphicsSceneMouseEvent *event);
    virtual void mouseReleaseEvent(QGraphicsSceneMouseEvent *event);

private:
    QPointF initPos;
    bool dragging;
};

class DescriptionItem : public QGraphicsTextItem {
    Q_OBJECT
public:
    DescriptionItem(ExtendedProcStyle *p);
    void mouseReleaseEvent(QGraphicsSceneMouseEvent *event);

protected:
    QRectF boundingRect() const;
    void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget);
    bool sceneEvent(QEvent *event);
    void contextMenuEvent(QGraphicsSceneContextMenuEvent *event);
};

}    // namespace U2

#endif
